HTML Formatter with Preview

The tool accepts raw HTML input and returns a formatted HTML string and optional minified variant. It provides a live preview to visualize changes as you edit, enabling rapid iteration on templates and components. Conceptually, the workflow parses the input into a tree, applies deterministic serialization rules, and emits a clean, readable output that preserves semantics and structure. Beneficiaries include frontend engineers, UI designers, and content teams who strive for consistent markup across projects. Its unique value lies in combining real-time feedback with robust handling of DOCTYPE, comments, boolean attributes, and self-closing tags, while offering an optional minification path for production code. Core features include mode selection (pretty vs minify), whitespace management in text nodes, and idempotent reformatting to ensure repeated formatting yields stable results. Use cases span template refinement, code reviews, and rapid scaffolding of HTML articles and emails. The tool operates offline and does not fetch remote resources, ensuring reproducible outputs in isolated environments. By adhering to HTML5 standards and preserving encoding, it supports Unicode attribute values and modern markup practices. This makes it suitable for teams needing deterministic, auditable formatting without introducing rendering side effects.